Window Server之所以提供光标（pointer cursor）的支持，是因为在使用鼠标、手写笔时可以象使用一个指针设备（pointer device）一样有效。
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follow-the-pointer device 随动装置
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A handheld pointer device provides radiation with a directional characteristic relative to its main axis.
一种手持式指向设备，提供相对于其主轴具有方向特征的辐射。
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A computer mouse is the device that moves the pointer,or cursor, on a computer screen.
VOA: special.2010.03.28
Using a pointer device you can pick any place on a traditional-looking globe and the screen display below spews out facts and figures about the locale.
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